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Lesson Example Discussion Quiz: Class Homework

Step-4

Title: Time coversations

Grade: 6-a Lesson: S2-L8

Explanation: Hello Students, time to practice and review the steps for the problem.

Lesson Steps

Step	Type	Explanation	Answer
1	Problem	Find the surface area of the rectangular solid(15mm,20mm,16mm)
2	Step	The given values are	l = 15 mm , w = 20 mm and h = 16 mm
3	Formula:	The surface area of rectangle solid	\$Surface Area = 2lw + 2lh + 2wh\$
4	Step	Now substitute the values	\$surface area = 2 times 15 times 20 + 2 times 15 times 16 + 2 times 20 times 16\$
5	Step	After simplification	\$Surface area = 600 + 480 + 640\$
6	Step	After simplification	Surface area = 1720 mm
7	Step	The surface area of the rectangular solid is 1,720 square mm.
8	Sumup	Can you summarize what you’ve understood in the above steps?
9	Choice.A	This is not correct because the calculated surface area is 1720mm², not 1820mm²	\$1820mm^2\$
10	Choice.B	This is wrong because the measurements use different units. Use units for height, not area	\$1720mm\$
11	Choice.C	This is correct because the calculated surface area is 1720mm²	\$1720mm^2\$
12	Choice.D	This is wrong because the measurements use different units. Use units for height, not area	\$1820mm\$
13	Answer	Option	C
14	Sumup	Can you summarize what you’ve understood in the above steps?

Step

Type

Explanation

Answer

Problem

Find the surface area of the rectangular solid(15mm,20mm,16mm)

Step

The given values are

l = 15 mm , w = 20 mm and h = 16 mm

Formula:

The surface area of rectangle solid

\$Surface Area = 2lw + 2lh + 2wh\$

Step

Now substitute the values

\$surface area = 2 times 15 times 20 + 2 times 15 times 16 + 2 times 20 times 16\$

Step

After simplification

\$Surface area = 600 + 480 + 640\$

Step

After simplification

Surface area = 1720 mm

Step

The surface area of the rectangular solid is 1,720 square mm.

Sumup

Can you summarize what you’ve understood in the above steps?

Choice.A

This is not correct because the calculated surface area is 1720mm², not 1820mm²

\$1820mm^2\$

Choice.B

This is wrong because the measurements use different units. Use units for height, not area

\$1720mm\$

Choice.C

This is correct because the calculated surface area is 1720mm²

\$1720mm^2\$

Choice.D

This is wrong because the measurements use different units. Use units for height, not area

\$1820mm\$

Answer

Option

Sumup

Can you summarize what you’ve understood in the above steps?